Optimization and Aerodynamic Characteristics of New Air-Cushion Nozzle of Floating Furnace for Autom

• 作 者: Yong Li Jiadong Li Xiong Ling Zhaodong Wang Tianliang Fu Yi Han
• 机 构: State Key Lab of Rolling and Automation,Northeastern University,
• 出 处: Journal of Harbin Institute of Technology
• 发表日期: 2017年01期
• 关键词: air-cushion nozzle aerodynamics air-cushion jet model floating furnace COMSOL

It is very important to develop new air-cushion nozzles so as to raise the heat treatment property of aluminum alloy automobile body sheet(ABS). A geometric model of air-cushion furnace equipment of ABS was built up and flow field was simulated by using k-ε turbulence equations of COMSOL Multi-physics. The influence and regularity of number(n),diameter(d) and arrangement of middle hole,and main control parameters of new air-cushion nozzle on aerodynamic characteristics and flow field were studied. The results show that:1) with n increases,airflow vortexes in air-cushion area increase in multiple; d decreases or n increases,air cushion pressure(p_c) becomes uniform; 2) average of p_c is proportional to pressure in nozzle box(p_t),when n increases,ratio of average of p_c to p_t increases,and when n ≤ 3 and d < b / 2,they have little effect on ratio of p_c average to p_t; 3) when n is an even number,n ≥4,and d ≤ b/2,p_c shows good uniformity; when n is an odd number,the center hole affects p_c uniformity greatly,and,when diameter of center hole is less than b / 4 and diameter of non-center is between b / 4 and b / 2,p_c has good uniformity. A new air-cushion jet model was presented,and the deviation of this new model with simulation data and experimental measured data are less than 7.75% and 7.76%,respectively. The present research is valuable for improving air-cushion stability,Al strip temperature homogeneity,and temperature control precision. It is very important to develop new air-cushion nozzles so as to raise the heat treatment property of aluminum alloy automobile body sheet (ABS). A geometric model of air-cushion furnace equipment of ABS was built up and flow field was simulated by using k-ε turbulence equations of COMSOL Multi-physics. The influence and regularity of number (n), diameter (d) and arrangement of middle hole, and main control parameters of new air-cushion nozzle on aerodynamic characteristics and flow field were studied. The results show that: 1) with n increases, airflow vortexes in air-cushion area increase in multiple; d decreases or n increases, air cushion pressure (p_c) becomes uniform; 2) average of p_c is proportional to pressure in nozzle box p_t), when n increases, ratio of average of p_c to p_t increases, and when n ≤ 3 and d